CO_2流体-长石相互作用实验研究

Study on Interaction Between the Feldspar and CO_2 Fluid

不同温度下(100、200、300℃)CO2流体与富钾长石和斜长石的水热实验表明:随着温度的升高,长石的溶蚀强度逐渐加大,且钠长石的溶蚀程度强于钾长石。在CO2流体与富钾长石及斜长石反应后,200℃和300℃时样品表面均有球粒状、棒状及花状的水铝矿生成,且200℃时样品表面有菱铁矿生成;在CO2流体与斜长石反应后,300℃时样品表面有球形的氧化亚铁析出。这表明CO2能够以碳酸盐的形式在矿物中'固定',其被'固定'的上限温度为200℃左右。

Based on the study of hydrothermal experiment on the interaction between the K-feldspar,plagioclase and CO2 fluids at different temperature（100 ℃,200 ℃and 300 ℃）,it is suggested that the corrosion intensity of feldspar should gradually be enhanced as the temperature increases,and albite is stronger than the corrosion degree of K-feldspar.After the reaction between the K-feldspar,plagioclase and CO2 fluids,the spherulitic,rod-like and flower-like gibbsite occurs on the sample surface at 200 ℃and 300 ℃;and siderite forms on the sample surface at 200℃.Spherical ferrous oxide precipitates on the sample surface at 300 ℃ after the reaction between plagioclase and CO2 fluids.The formation of siderite（at 200℃） and the precipitation of FeO（at 300℃） on the sample surface showed that the CO2 can be captured in the mineral as the form of carbonate,the upper limit temperature that can be captured is around 200℃.